Ok. Let's say more cleary: Quite easy after you find the idea. Better now?
Failed pin
I thought it was easy, I saw the obvious way out in about five seconds. But maybe it's just a Finnish thing. Nice though!
The solution is the only reasonable way to keep black in check. Knowing that it's a puzzle, it's not hard to just follow the checking line.
It is pretty easy :). Lol there's only one candidate move, and since this is a puzzle with a solution it MUST be the correct one. Seeing the rest of the thing through honestly took less than it did to type this post (although I had to type "candidate about 3 times before I was sure I spelled it correctly)
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Quite easy, but nice. (Buzzle from a Finnish chess book: Shakki; Ristoja. 2004.)